Within a life

SO, I have to practice my english and I'm so lazy e.e.
Sometimes I think that I know how to speak in english but then I watch a movie or something on the TV and I can´t understand and I feel sad, I mean, I concerned about my english.
The reason why I like this lenguage is that i love knowing other cultures, and the american culture is one of my favorites.
And I always was exposed to all the sitcoms of the tv that let me know this culture.

I hope to go to USA one day just to visit, I don't want to live there, before yes but now I ´m looking for other countries.